Final answer:
The perimeter of the rectangle with a width x and a length of x/3 - 3 is expressed as 8x/3 - 6.
Step-by-step explanation:
To express the perimeter of a rectangle described by the condition that its length is 3 units shorter than one-third of its width, x, we can use the perimeter formula for a rectangle: Perimeter = 2(length + width).
If we let x represent the width of the rectangle, the length would be represented as x/3 - 3 (since it is said to be 3 units short of one-third of the width).
So, the expression for the perimeter, using the variable x, would be:
Perimeter = 2((x/3 - 3) + x)
= 2(x/3 + x - 3)
= 2(x + 3x/3 - 3)
= 2(4x/3 - 3)
= 8x/3 - 6